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Meanwhile, some stunts are a piece of cake in space, like somersaults and floating, and some muscles that are rarely used on Earth are key here. For example, the upper arms are crucial for moving since we need to grasp things and pull ourselves along.

It will accommodate three to six astronauts, who will stay in space up to one year.

Stressing that China and Serbia are "trustworthy friends of each other," Vucic said the two countries have conducted sound cooperation and scored achievements in areas of infrastructure construction, energy and mining.

He said although some developed countries have come up with a roadmap for financial support for developing countries, it still falls short of the rich countries' commitment of providing 100 billion U.S. dollars a year in assistance by 2020.

Local officials and residents also gathered at Sun's former home in Shanghai and bowed three times to pay respects.